Updated at 11:04 a.m.: George W. Bush spokesman Freddy Ford just sent word that the former president will be busy on Tuesday and won't join his wife, Laura, and Ann Romney for a women's lunch fundraiser at his home.

But Ford added that Bush and the former first lady are "happy to host Mrs. Romney at their home."

Original post: Ann Romney -- wife of the GOP presidential nominee, Mitt -- is slated to hold a fundraiser next week at former President George W. Bush's Preston Hollow home.

NBC News, citing a Romney spokesman, reports that former first lady Laura Bush will host the luncheon on Tuesday, although it's unclear if the former president will be in attendance. A Bush spokesman didn't immediately respond to a request for comment.

And regardless of Bush's approval ratings -- and the inherent political calculations that requires of Romney -- the former president still has vast fundraising connections, particularly in donor-rich Texas.

So Tuesday's event at the Bush home -- which will be closed to the press, per NBC News -- could be a key cash infusion ahead of the presidential campaign's home stretch.